require 'digest/sha1'
class User < ActiveRecord::Base
	has_many :posts
	has_many :replies

	has_many :permissions, :dependent => :destroy
	has_many :roles, :through => :permissions

  has_attached_file :avatar, 
									  :url => "/:class/:attachment/:id/:style_:basename.:extension",
										:path => ":rails_root/public/:class/:attachment/:id/:style_:basename.:extension",
  									:styles => { :medium => "100x100>", :thumb => "50x50>" },
  									:default_style => :medium
	has_many_friends

  # Virtual attribute for the unencrypted password
  attr_accessor :password

  validates_presence_of     :email, :if => :not_openid?
  validates_presence_of 		:login, :if => :not_openid?
  validates_length_of       :login,    :within => 3..40, :if => :not_openid?
  validates_uniqueness_of   :login, :email, :case_sensitive => false, :allow_nil => true
  validates_presence_of     :password,                   :if => :password_required?
  validates_presence_of     :password_confirmation,      :if => :password_required?
  validates_length_of       :password, :within => 4..40, :if => :password_required?
  validates_confirmation_of :password,                   :if => :password_required?
  validates_length_of       :email,    :within => 3..100, :if => :not_openid?
  before_save :encrypt_password
  
  # prevents a user from submitting a crafted form that bypasses activation
  # anything else you want your user to change should be added here.
  attr_accessible :login, :email, :password, :password_confirmation, :identity_url, :avatar, :admin

  # Authenticates a user by their login name and unencrypted password.  Returns the user or nil.
  def self.authenticate(login, password)
    u = find_by_login(login) # need to get the salt
    u && u.authenticated?(password) ? u : nil
  end

  # Encrypts some data with the salt.
  def self.encrypt(password, salt)
    Digest::SHA1.hexdigest("--#{salt}--#{password}--")
  end

  # Encrypts the password with the user salt
  def encrypt(password)
    self.class.encrypt(password, salt)
  end

  def authenticated?(password)
    crypted_password == encrypt(password)
  end

  def remember_token?
    remember_token_expires_at && Time.now.utc < remember_token_expires_at 
  end

  # These create and unset the fields required for remembering users between browser closes
  def remember_me
    remember_me_for 2.weeks
  end

  def remember_me_for(time)
    remember_me_until time.from_now.utc
  end

  def remember_me_until(time)
    self.remember_token_expires_at = time
    self.remember_token            = encrypt("#{email}--#{remember_token_expires_at}")
    save(false)
  end

  def forget_me
    self.remember_token_expires_at = nil
    self.remember_token            = nil
    save(false)
  end

  # Returns true if the user has just been activated.
  def recently_activated?
    @activated
  end

  
	def has_role?(role_name)
		roles.find_by_name(role_name) ? true : false
	end  

	def admin?; has_role?('admin') end

	def to_s; login end
	def to_param; login end
  def has_friends?; !friends.empty? end
  def me_and_friends; [self] + friends end

  protected
    # before filter 
    def encrypt_password
      return if password.blank?
      self.salt = Digest::SHA1.hexdigest("--#{Time.now.to_s}--#{login}--") if new_record?
      self.crypted_password = encrypt(password)
    end
      
    def password_required?
      not_openid? && (crypted_password.blank? || !password.blank?)
    end

		def not_openid?
			identity_url.blank?
		end
end
